Nb含量对Fe-22Mn-0.4C合金层错能和力学性能的影响  

Influence of Nb content on the stacking fault energy and mechanical properties of Fe-22Mn-0.4C alloy

作　　者：代永娟[1] 米振莉[1] 唐荻[1] 江海涛[1] 吕建崇[1] 

机构地区：[1]北京科技大学高效轧制国家工程中心,北京100083

出　　处：《北京科技大学学报》2009年第S1期185-189,共5页Journal of University of Science and Technology Beijing

基　　金：国家高技术研究发展计划(863计划)(2008AA03E502)

摘　　要：研究了微合金元素Nb对Fe-22Mn-0.4C合金层错能和力学性能的影响,利用X射线峰位移法测量计算了不同Nb含量的Fe-22Mn-0.4C合金的层错几率变化.结果表明随着Nb含量的提高,合金的层错几率降低,层错能提高.同时,Fe-22Mn-0.4C合金在拉伸变形过程中,变形机制由以TRIP效应为主导机制变为以TWIP效应为主导机制.不同的变形机制使不同Nb含量合金的力学性能发生变化,并使变形后的层错几率出现不同的变化量.The influences of microalloy element niobium (Nb) on the stacking fault energy and mechanical properties of Fe-22Mn-0.4C alloy were analyzed. The stacking fault probability of Fe-22Mn-0.4C alloys with different Nb contents was determined by X-ray diffraction (XRD) profile analysis. The result shows that,with the increase of the Nb content,stacking fault probability decreases and the stacking fault energy of the alloy increases. During tensile deformation,the dominated deformation mechanism turns from transformation induced plasticity (TRIP) gradually into twinning induced plasticity (TWIP). Different deformation mechanisms play roles in the alloys with different Nb contents,which lead to changes in mechanical properties and stacking fault probability.

关 键 词：Nb 层错几率 Fe-22Mn-0.4C合金 力学性能 变形机制 

分 类 号：TG142.2[一般工业技术—材料科学与工程]